Alright let me clarify some things. I'm actually using the arcana evolved magic system...I figured I'd save some time explaining the differences and just convert it to 3.5 lingo, but since that has everyone riled up

I'll explain in detail.
First, the party has a large giant with str 28, he has no problems getting the statue out.
Second, my party is 16th level and has acquired some very nice bags of holding. I have always been lenient about them to make the game go smoother, I don't mind them putting things in the bag they shouldn't really be able to.
Third, the spell was not actually contingency, its a template in arcana evolved that lets you cast programmed spells (it is a much stronger contingency if you will).
Fourth, the "wizard" did in fact have a teleport contingency, but that got dispelled. The remaining one was for petrification, which took place one hour after the effect.
Fifth, the "wizard" did not cast plane shift because plane shift is an 8th level spell in AE.