but one day...

Kinda like with plastic shopping bags. As we get further and further from the date where they were banned (in Canada), I regret the times when I decided that I had enough of them for now and threw some out.
Though I'll probably just start using the smaller garbage cans without a bag once I run out and maybe just clean them every now and then instead of actually spending money on any garbage bags other than the big black ones.

We have guinea pigs, so the definition of "good box" has changed to something that is just the right size and shape to be made into a hidey.
As soon as we put in the new box, the girls start destroying it, so we need a constant supply.
- I call em spaceships for my cats lol

I kept all the good boxes i used to move, for eight years. Finally thought I obviously don't need these taking up space, and trashed them.
Two months later I had to move.
Keep yo boxes fam.

My brother and his wife visited over the weekend so we did some major cleaning and I had to break down and throw into the recycling bin several perfectly useable moving boxes that have been sitting around for a year “in case I needed boxes”. Then I learned when they arrived that they were moving to a new place soon and could’ve used the ones I threw out.
- That's some "Gift of the Magi"-level stuff right there. "Oh dang, I threw away a bunch of boxes yesterday!" "Oh no, we were going to help you clean your house!"

I would unironically be honored if someone left me their collection of high quality cardboard or cardboard-adjacent boxes

Too true, got a collection of good moving boxes in the shed after a house move. Slowly using them as painting floor though.
- I had to trash mine after the rats decided they were a good place to piss.

Everyone has that one moment when they realize just how expensive a good box is if you need to go out and actually buy one with money.