I still have two! They're both USB ball mice.
First up is a promo item for Enfamil, a baby formula. These sort of little handout promo items were pretty common in healthcare settings all over the place until the Affordable Care Act came about in 2010, specifically it's "Anti Kickback Statue" which threatened penalties to physicians that might accept "excessive" vendor gifts. While it was likely meant more to curb things like luxury gifts and other items that might influence prescribing habits, these sort of things fell out in a big way. While the law has been better defined in the years since, branded computer accessories aren't nearly as common anymore.
This thing has some scratches on top, but doesn't have too many signs of ever being used. It's likely that this thing spent it's days in a desk drawer. The liquid level inside is lower than when it was manufactured though. I've kept this (and it's Target counterpart) in sealed plastic bags to prevent possible leaks and perhaps to help stave off any minute evaporation that might be taking place. It is mighty dry down in the shop, so it might help a bit.
The camera would not focus on this part at all I'm afraid- this is the best photo out of more than a dozen I took, so sorry it's a bit blurry still. The blue liquid inside has "congealed" into one blob that seems to be stuck to the bottom of the can. The can itself is supposed to be a can of Enfamil Lipil powdered baby formula. Enfamil last used this version of their logo in 2012, putting it in chronological place with the ACA's "anti kickback" portions taking effect. Interestingly the little can is missing the Beatrix Potter rabbits on it, which are shown prominently on all of their pre-2012 products (example below). Did the license to use the rabbits on their stuff not carry over to mini versions of their products placed into computer mice? This part was quite a rabbit hole when I was looking it up... no pun intended.
I could not find the exact can though, so this red one will have to suffice.
Not much going on on the bottom.