I thought there was a place at Theword.com where I could see a complete list of the modules I've purchased, but I can't find it.

All I can find is the place at Thewordbooks.com that has my "recent" orders. There are only two. I know I've purchased way more than that over the years.

Is there a way to check my complete list of purchases?

There are possibly two different places to check. Also you would need to know what email address you used for purchase/login
For modules purchased from "theword.net" go to the Help tab->Recover Unlock Keys. Follow the instructions and you will get a list of modules you have purchased. If they don't all seem to be there, and you have used a different email for purchase at another time use that also.
Second place is from thewordbooks.com For modules purchased from there, (which is now the default place of purchase) you need to have an account at that site. Details of purchases from there are available in 'My Account' tab of that site.

Or you should have a bunch of emails that you have saved that contain the unlock key for the resource.

Good grief, I need a caretaker.

I never thought to scroll right to find the Help tab. And upon following your advice, I discovered I apparently purchased one item twice! Sheesh.

Anyway, thanks!