In one of the afternoons of the Oxford Conference on the Synoptic Problem we had a trip to the Papyrology Rooms at the Sackler Library. We had a helpful introduction to the collection from the curator, Dr Daniela Colomo, and then we passed around some manuscripts (including portions of the Gospel of Mary, the Gospel of Peter [well, maybe], the LXX and the NT), including one of the two NT manuscripts published in vol 72 of the Oxyrhynchus Papyri. This has only just been published, and the images are not yet on-line, but the basic details are as follows:
P. Oxy 4844 = P123, IVth Cent, 1 Cor 14.31-34; 15.3-6; images here.
P. Oxy 4845 = P124, VIth Cent, 2 Cor 11.1-4, 6-9; images here.
Up-date: These are now listed on the up-date site at Munster (here), so I have been able to add their identification in the NT papyri list.
Up-date II: I have added links to the images and some more details from the publication in Oxy Pap 72.