Hello,
On 28.05.20 the following Brandenburg C.I photos can be seen on ebay:
Hansa-Brandenburg C.I (U) 69.62 Flik 44/F
https://www.ebay.de/itm/ORIG-PHOTO-A...AAAOSwnAJezrPK
Brandenburg C.I (U) 69.97
https://www.ebay.de/itm/ORIG-PHOTO-K...sAAOSwR39ezrq9
Hansa-Brandenburg C.I (Ph) 229.23Flik 35
https://www.ebay.de/itm/ORIG-PHOTO-K...sAAOSwhClezrpd
Hansa-Brandenburg C.I (Ph) 229.31 Flik 2/D
https://www.ebay.de/itm/ORIG-PHOTO-A...0AAOSwmaBezrLw
Regards,
Clint