4-7 years?  Huh.  Well, I guess you could post 
descriptions of the dougas, and that way anyone 
with a similar sounding cel can just send you a 
scan of it along with the sequence number--that 
way you know it's not just someone saying, "Yes, 
I've got that!" because they want that particular 
douga, but because they actually do have it ^^>.

Good luck. Sounds like you've got your work cut 
out for you.