A series of moves apparently resulted in the loss of some ZF2SC buro cards in the 2007 to 2010 year range. If you have QSL'd via the buro and not received a reply, please try again, orsend an email to email@example.com, and I'll follow-up.
I've just requested a call sign certificate for ZF2SC and expect LOTW to be complete for 2015 operations in about a month.
I do plan to go back in time at least to 2010 and update the LOTW records. If you want an LOTW confirmation anytime back until 2000, just drop me an email and I will check the log and upload what you need to LOTW (the logs other than 2015 are all hardcopy only at this time).
73 Scott ZF2SC