I have the first two also. Best guess would be that they are worthless. Not being official, and the recordings being easily available today would not make these collectable, unless the sound quality is very good, in which case they are probably still not worth jack.
I keep them for sentimentel reasons.
There is a place in Halifax that sell bootlegs at quite high prices, they might be intersted if you live anywhere near there. Peace hall a record shop there with loads of Queen stuff all over the walls. It sells too even if its expensive!