I think I know which cel auction you're talking 
about. As you've said yourself, the shadowing is 
a little off. So I wouldn't worry too much about 
it. The auction cel could be one or two sequence 
numbers off.

And if you ever experience a similar situation 
again, you should go ahead and ask the seller for 
the cel number. I can't say for all sellers but 
from past experience, this particularly seller is 
very friendly and won't mind you asking questions.