He sold it privately, I thought it was a fair price for a MK1 and the combination tool as well.

Res, I think its fine mate and it is what its worth to you and the gap you have on a rifle for it to make it authentic.
I sold my 4T complete with everything matching etc in its chest at the tail end of last year to a Dutch guy for £4250.00.
It was a good price then, but they are going up slowly, where the L42A1 seems to be reaching dizzing heights complete in chests