How can I find products that may be missing from my lists?

(If you do not know the titles you are looking for:)

You could always try looking through other member collections. It may be tiresome and boring at times, but on quite a few occassions I have found missing items on the lists of other members. The members with the biggest collections are often the most useful, but also looking at members from your own country can help too.

Another method may be to look through actors/actresses/authors/etc pages and look for items you don't have on your lists already.