It’s an Outrageous Mystery Goody. We take something, make it cheap but don’t really tell you what it is. Why? We have our reasons. But they are good ones.
Huzzah! The game is afoot! Despite my better judgment and the advice of my good friend to not make deductions without data, I will throw caution to the wind and conclude that these are steel drinking vessels, and associated accessories ( ̶p̶r̶o̶b̶a̶b̶l̶y̶ ̶n̶o̶t̶ Ok, it’s Yeti).
“These were supposed to be vacuum sealed travel mugs, but the Amazon ASIN must have gotten mixed up. Regardless, we’re sticking by our position that we meant to send you a shower drain cover.”