Hello Oleg,
go to the website
https://invenio.bundesarchiv.de/invenio/login.xhtml > Suche ohne Anmeldung > Suche > Signatur (in this case RL 2-III/758 page 3 or RL 2-III/1180 page 411) > Suchen > Digitalsat anzeigen.
There you find the loss return of the Ju 88 A-4 WNr. 6610 3Z+LL and the missiung Ofw Ringmeier crew.
Regards
Leo