At first, I thought you might have been talking about single components. I've dropped more than one SMD item on the floor - and I rarely ever find them again. They just become some silicon sand that gets vacuumed up from the joints in the floorboards and the carpet pile.
But missing a whole container of something?
Yes, I've done that.
The latest was part of my LED collection. One container with contents I could name. Couldn't find it for a couple of weeks. Went through every container in the workshop. No luck. Gave up and moved onto another task.
Then one day, SWMBO brought over a bag and showed me what was inside and asked "Is this what you were looking for?" ... with a slightly critical look.
Lo and behold, there it was. I then remembered I had been over at my son's place a couple of months earlier, helping him build props from the game card franchise "Magic" for a show he was helping out with in Sydney. Two 'Hedrons' with coloured LED lighting, slowly fading in and out.
I'd left the bag in an out of the way corner of the living room - and completely forgotten about it.