Thanks to everyone for your extremely helpful advice - it's good to know that I haven't been hanging onto them all these years in vain!
I'll be selling my whole collection over the next couple of months, so it's really useful to know in what general area I should be pricing these. The figures themselves are in pretty much pristine condition (perfect stickers on R5 and R2, bright plastic and no wear & tear) so I assume they were either on display or stock that got damaged at retail somehow.
I took a few photos of my other 3 carded figures as well - these are Trilogo / POTF so I assume not quite so sought after...
(1) Anakin Skywalker - MOC Trilogo
(2) Romba - POTF (bubble cracked at top, sliced at bottom)
(3) Warok - Trilogo (bubble sliced at bottom)
The slicing of Romba and Warok was done by me...I really need to invent a time machine and go back to have words with my younger self!