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Yeah, you'll probably get 1 gold mat back for each piece.
Or you may get nothing...
RNG
On the other hand... if they are from the start of ESO & are lower than the current max level then they are pretty useless anyway, so personally I'd rather have a chance of a gold temper & 1 more inventory slot than something sitting there that won't be used (Or would be very sub optimal if it was).
Yeah, you'll get 0 - 1 Temper from each item, pretty nasty considering it requires 8 to make one. So you may get a few back or you may get none back. But hey, what would eso be without it's beloved RnG right?