I feel guilty not knowing how to let Anonymous know how much they've helped.

After doing one tiny search, there appears to be a lot of forums devoted to Anonymous.

Invalid Item  This item number is not valid. #189314 by Not Available.

Thanks Anonymous!  (ASR) Thank Anonymous for gifts you've received with no name attached... #912077 by Writing.Com Support

Invalid Item  This item number is not valid. #942723 by Not Available.

The one I've been going to and most likely will say thanks there is:

We Love In-Depth Reviews Comments Forum  (E) A place for people we've rewarded to leave comments, suggestions, thanx or complaints. #903877 by NaNoKit

That's the first forum I'd ever been pointed to.