I bought an open box SP3-I5/256 device and it had a Admin password in the BIOS set, so Microsoft exchanged it. The serial number was in the 05 range. The replacement came and it had heat issues. It too, after some discussions here, was returned. That serial number was in the 03 range. Today I received notice of a shipment. The exchange unit is in the 01 range. I have a pit in my stomach. Is that unwarranted or should I be concerned? Any guidance is appreciated.