Okay...so here are two ideas I would consider:
1- glue a loop of an elastic band on one side of the lid. Do this to at least 4 lids, do 8 if you want to have a set too....Then show him how to put them on a middle finger and a thumb on each hand and tap them together to make a sound....like little finger musical symbols. You could do this to help him with his fine motor skills between tapping each finger to the thumb while teaching him what each finger is called.....sounds fun to me!
how cute if he had one on each finger....
2 - print a headshot of picture of each person in your family affix it to one side of the lid and write clearly (white background w/ red or black ink) the name of that person in your family. then put them with words up on a table or floor and ask them to find "mom" .... this will teach him to search for "mom" ......I'd start with just a few pictures at first......be sure to include a picture of him and write his name out rather than using "b-a-b-y"
With left over lids you could share the same ideas with some friends or neighbors :-)
Enjoy! Let me know what you think and if it works!