IF you bought it with the understanding that it had the OEM electronics and the seller represented it as such, angering said seller would not keep me up nights.
ON THE OTHER HAND . . . . sight unseen? On EBay? Really?
For me, IF this axe was exactly what I wanted save for some finish touch-up and an S1 electronics package, that would still be way, way less than duplicating this at today's prices, if that refurbished axe is really what you wanted to begin with. In that case, you'd be money ahead.
You could probably put in AXY's or FatBoys my vote) and a tone circuit, and if I remember, I've seen Mica talk about a setup where you can complete a full Series installation at a later date: It looks like the hum-canceller is still there, so that may be an option.
I'm a complete slob for flame koa, so I may be a wee bit gobsmacked by these photos !
J o e y