Re: DMLE.
Dear Diary, on the lam again. Sucks all round, but at least the weather's nice.
I'd say it was possible they wanted to try to straighten up their memories or something after being stuck with Dementors but they wouldn't need to get hold of a magical journal for that. I guess he just wants to mess with us... and have a way of contacting people. Pity we can't even track these back to where they were bought or anything.