how much are these tokien books worth ?

Most of them would be a few pounds each, you may get up to 20GBP for the older items, the books from George Allen & Unwin depending upon condition.

Have some of the wrappers been trimmed ?

Most of them have very little monetary value.
The exception being the David Day books: those not only have no monetary value, but they also are lowering his property values.
Dispose of those forthwith.