Artemission, an antiquities company based out of the UK, is selling a little Coptic papyrus fragment on their website for $1,400. The website claims "2nd-3rd century" for the dating of this papyrus, although that is certainly not correct, as it is much later. It would appear to be a private letter, written on the verso, in which a certain "John the camel-driver" makes an appearance in line 5. The terms πρεσβεία ("intercession") and ἀγάπη ("love") also appear. The address is in the first line(s).
As for the provenance, the website simply states "ex. Private UK collection, London, UK, acquired in the 1990’s." Artemission is selling another Coptic papyrus on their site, but I think I've included that somewhere on this blog before, or at the very least, I have already seen it. The provenance listed for that one is "ex. property Mr. M. N, London, UK, acquired in the 1990s," which is most probably a reference to Maurice Nahman, a famous antiquities dealer during the early twentieth century. It would be interesting to know just how many papyri were sold from Nahman's estate and where they are precisely.