Apple have attempted to destroy these hence damage. I believe the actual chipsets are fine. They have DV markings and barcodes. Serial numbers show up as invalid
4x Apple Watch (38mm A1553) - 2015 Apple “DVT” Internal Prototype Units S1 SOC
5x Apple Watch (38mm A1553) - 2015 Apple “DVT” Internal Prototype Units S1 SOC
Apple Watch (38mm A1553) - 2015 Apple “DVT” Internal Prototype Unit - S1 SOC
4x - Apple iPad 4th Gen. 16GB, Wi-Fi, 9.7in - Black - JOBLOT - WORKING