Probably ordinary 8,8cm Flak 18 cases - used in both the Flak 18 AA gun and the KwK 36 gun used in the Tiger E. To ID them as tank gun cases, they’d need to have the original stencilling intact on the side and / or a C/22 primer that had never been removed. The 8,8cm KwK 43 cartridge case used in the Tiger B is very different.Not sure as I didn't examine them - assuming it should therefore have a head stamp markings of: KWK43 for the King Tiger or Tiger 88