That would be a matter of opinion. If it has been 4473'd to you, it is not the "property" of the 07 and would not need to be marked if you, the person, built it up. But some IOI's and agents *might* take the position that you the individual and you the SP 07 are one and the same and thus pitch a fit if there was not a marking. I would tend to err on the side of conservative caution and mark the receiver in such a case.