Stainless steel can be magnetic. 316 has a slight magnetic pull to ans 316L will have even less as you move up on the ladder to the high end of the type of stainless material the lower the carbon will be found in the material. if this was used for display it most likely a 316 or 316L stainless, it could have been made out of 304 stainless if it was a higher end display. if the sheets are in production condition you might want to find a fab shop in your area they may offer allot more for them then the scrap yard. The only way to find out the grade for sure is to have it tested with a PMI gun or chemical analysis. I hope this helps out )
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