LEGO old Gray and new Gray 15" x 15" new gray 15"x14 Baseplates 6 total

LEGO Base Plates Lot six (6) total. 4 are old Gray 48 x 48 dots 15" x 15"; 1 new Gray 48 x 48 dots 15" x 15" and 1 new Gray 48 x 45 dots 15" x 14" - this one was cut down one side which is why it is 1" shorter. One of them has a few black spots (see pics) and one is yellowed. Some cleaning may need to be done on them. There are no cracks or chips.