Blue Lagoon/ Mikimoto Cert?

Husband bought from an on base BX some Blue Lagoon division of Mikimoto 18 inch 6x6.5 mm pearls for $1099. Are they supposed to come with a certificate of authenticity? My pearl earrings in the past ( not Mikimoto) came with one and so did my diamonds so I would assume the necklace would. Was it supposed to? Thanks in advance.