Hello,
Currently on ebay is a photo of an early LVG B.I at:
https://www.ebay.de/itm/Foto-2-Deuts...AAAOSwVpRe4dRY
https://www.ebay.de/itm/Foto-1-Deuts...oAAOSwbqle4dTs
The machine appears to have no B before the 38 and is possibly wearing a flying school number rather than a serial number.
Regards,
Clint