On Wed, 27 May 2015 00:41:39 -0700, fred wrote:

It now appear he has glued on the dust caps

I doubt it. That'd be ridiculously petty.

on the new tubed tyres.

Tubed? Really? I'd be very surprised. Or are they VERY old wheels which
can't be used tubeless?

I don't know what he used but there is no shifting the caps either by
hand or with the aid of two pair of pliers. (one to hold the stem, one
to twist the cap).

Rubber-stem valves?
I wouldn't want to be using a pair of pliers on them, tbh.

Any other suggestions to shift them ?

If they REALLY, REALLY can't be shifted, then take it to a local tyre
place, and ask them to fit new tubes.