Well, the real question is: Did all that ammo come with labels saying what the recipe for each one was?? If the answer is NO (and I'd be shocked if it was, but it's still possible, as we all know...

) then you have no choice whatsoever, and you have to pull everything. Even if the guy knew what he was doing, not labeling EVERY box of ammo is unforgivably sloppy, which of course makes you question how carful the guy was loding up the stuff in the first place.
If it IS labeled, then you can consult some loading manuals and see if the stuff is within the reccomended limits or not. The problem here, of course, is that evrybody knows that 38 Super ammo gets hot-rodded 3 ways from Sunday to make Major PF, so it's better than even money these may be hot loads.
Next, what kind of brass is used in these loads? Actual 38 Super brass, 38 Supercomp brass, 9x23 Supercomp brass, or 9x23 Winchester brass? In the order these cases are in, they go from weakest to strongest left to right. The pressure limit for 38 Super Auto +P is 33,000 PSI, while 9x23 Winchester brass can handle 52,000 PSI and it's not a SAAMI registered cartridge just for that reason.
Lastly, what kind of barrel does this gun have? Is it a stock 38 Super barrel, or a ramped after-market barrel that is considerably stronger and supports the complete case body?? (Nowlin, Bar-Sto, etc.) I have to believe it's not a stock 38 Super barrel, because the whole reason the 38 Super sat around getting no attention whatsoever for decades was that the semi-rimmed 38 Super cartridge headspaced on this tiny little rim, which made for horseshyte cartridge alignment in the chamber, and nobody wanted a 1911 that was punier than the 45 ACP and less accurate as well. It wasn't until about 1980 that the IPSC crowd started hot-rodding this round to make major that rimless cases which headspaced on the case mouth came along.
If you have a recently made race gun, I have to believe the thing is set up for rimless ammo and has a fairly strong barrel. My sub $500 EAA Match in 38 Super can digest 9x23 factory loads with no problem (with a heavy recoil spring).
So: There's the relevant questions. What are the answers?