Hey! What were you doing at my place, taking pictures?
Yeah, no, we've got a gazillion of those totes around here that Dad "acquired" from work. The crazy thing is they are better than rubbermaid/sterilite styles for storage and hauling of many things, yet I have never seen a truly similar item for sale to general consumers.
Well at my Post Office they had a stack of used PO bins like that out in the lobby for the taking. Beats having to recycle them, I guess. Immediate re-use is the best kind of recycling. Your Dad probably didn't "liberate" them, they were probably up for grabs anyhow. I have a couple of them myself. Real handy even if well-used, real sturdy, especially good because of the handle cut-outs in the ends.
I suspect each PO station gets new ones every year just 'cause it's in the budget from the year before.
If you do a lot of mailings, the PO will provide them to you so you can sort and put the mail directly in their bins. I always had three or four extras around when I had my store.
Terry