i'm pretty sire i know what the horcruxes are: Godric Gryffindor's shield, to go along with the sword, will be found at Godric's Hollow when Harry goes there for the first time to mourn his parents.

Tiara: the 'lovely goblin-made tiara' that Mrs. Weasley offered to let Fleur wear for the wedding is a probability. Why else would it have been mentioned? Just like the locket, right? Mentioned in passing and had significance later. So I think the tiara is Ravenclaw's horcrux. Besides, we don't know anything about Auntie Muriel anyway.