Any idea what this item might be?

[Firesprocket]

I received a few extra drop ships in an order that I bought say about year or two ago, but have no idea what they are because I didn't place the order for them.  I offered to return them at the time, but was just told to keep them.  The bag they came in were labeled with a Sku of BT209 written on the outside of them but I can't find that on IWM site currently.  Any idea has to what I might have?

[cavingjan]

BT209 is supposed to be the Serium BA.

[Firesprocket]

have passed the bag onto something else.  I'll have to put together a photo.  Because it is most certainly a drop ship.