a perfectly distributed combination of tupperware/lids such that no combination of container and lid actually fits together.

You steal all the files on their computers that make system sounds. And you do something similar to everything in the house that makes sounds - like the beep of their microwave oven or the "hot enough" beep of their oven. But you leave the doorbell alone because it will bother them.

Why did they leave the doorbell alone?

Not your keys, but the ring the keys are on

The removal of one-third of the zipper teeth in every article of clothing you own from random places along the line.

A hairline portion of the bottom of your favorite shoes so that they now slowly wick up water from any surface you step on into your insoles.

Removing every groove on one out of seven items in your house that have screw caps.

If you have an office chair that has a gas cylinder for variable height adjustment, I steal half a millimeter of your gas cylinders gasket seal, making it so it slowly fails and sinks you every time you sit down for significant periods of time.

Stealing the wires out of your fridges internal light bulbs sockets.

Steal random bits of the fluff in your pillows so it becomes more uncomfortable.

Steal the mesh strainer for your kitchen drain.

If you have a water boiler where you live, Steal the small metal plate that protects the pilot light inside your water boiler from random gusts of wind.

Steal 1-2 links in the chain that connects the manual activated flushing lever on the exterior of the toilet tank to the flushing valve inside the toilet tank do there's constant leaking water into the bowl.

Remove one of the screws to the door frame lock receptacle for the door knob mechanism so it occasionally mildly binds up attempts to open or close the door.

Steal the copper wires that feed specifically into the microwave generator part of the microwave so it does all the normal shit it'd supposed to do but doesn't warm your food.

Steal from your second favorite set of shoes, the shoe laces off of one shoe and the tongue of the other shoe.

Steal enough fibers out of your tooth brush that all the bristles fall out the moment you use it.

If you have a car, either steal its air filter or the plastic tubing between your windshield wash fluid tank and your wipers.

If you wear baseball caps, Steal the back part of the hat that makes them size adjustable

If you wear glasses, Steal the plastic-rubber off of one of your nose pieces.

The ends of the shoe laces that keep them from fraying.

Dishes hidden in the back of the shelves that are only brought out during holidays and special occassions.

Condiments in the fridge that are less than 1/4 full.

Toilet paper roll holder.

batteries from their remote controls

I'm taking all your phone chargers except that one you have to hold juuust right to work

The innards of various buttons. So like, the button cover is there, but they won't click and they'll have no spring to them.

Steal nothing, but they'll think it was me every time they misplace something.

Your heart

the election

Who needs all those use by labels anyway?

The rotating plate in the microwave

cut the aglets off their shoes

Power strips, but only if they're behind heavy furniture.

All the USB-C cables and all of the USB-A wall chargers

The TV remote.

USB charging cables.

Lids. From tupperware, jars, whatever.

TP off the roll

I'm removing all the bookmarks and leaving them in a pile

Depending on where they live: Any/all loose change

Smart home hardware. Maybe even just a couple resistors out of the device.

All the potholders. I put benign objects in their place so that my victims don't notice their absence until they need them.

Half of their junk drawer

every butter knife

all of their money and other mobile assets

one of the rolling slide thingies on the inside of their drawers

half a belt (cut it in half)

some of the buttons on the TV remote

the ice cube trays

All the chains from the toilet water reservoirs

One screw from every object I can find.

Shoelaces.

Toilet seat.

The light bulb in the refrigerator.

all but one of each type of battery

stealing an air fryer's tray/compartment thingy

Stealing the batteries out of your car key fobs.

1 from each pair of socks in their sock drawer.

All of their good ballpoint pens.