The museum website notes: "If this blonde lock of hair is indeed that of Marie Antoinette it must have been presented before the abortive flight to Varennes in 1791, when the King and Queen tried to escape from France. Marie Antoinette's hair went white overnight, and on her return to Paris she presented a ring to the Princess de Lamballe containing a lock of her hair which was inscriber 'Blanchis par la douleur (whitened by sorrow: see Campan 1833). The ring is now in the Musee Carnavalet, Paris."
I don't know how good the provenance is of these items but I like to think they are genuine.
Here are the other photos I found. This locket is in the Musee Carnavalet along with the ring mentioned above.
I don't know where these other two items are located. If you can elaborate on any of the items I'd love to hear from you.