When I freeze leftovers I use whatever may be handy (I’m talking to you cool whip and butter tubs) and there isn’t a really good way to label them. The freezer tape doesn’t really work and the little stickers fall off. I’ve started using blue tape and it has really helped.
I keep a roll on top of the fridge with a sharpie in the middle for easy access and put what it is and the date and then tuck it in the freezer.
Hope this helps someone out there – who like me, has mystery frozen leftovers.