well...
http://www.cygnusx1.net/supra/library/TSRM...M/ra/RA_61.html
theres the supra owners bible
that shows removal of the arms but where it's got a picture of a bolt and a round tab and they mark "matchmarks" on there (figure 3)... that is the camber tab they need to adjust
i would highly recommend considering another suspension shop to get your camber adjusted if this shop cannot find it for themselves to be honest
but it is up to you... if you insist on going there maybe redirect them to the link i've shown above and they will then know what to do
good luck on the camber
upload some pics of your car if you can get some