Inventory import and adjustment question

I have to import new item records (serialized and using bins). There are some that I can do in a single file import because the cost per unit is the same, so I simply import these in on one line.

There are others that have multiple unit costs per sets of serial numbers so I was importing only the item record basics (0 quantity) and then performing an inventory adjustment to add in the specific unit costs to serialized units so they are tracked properly.

I have a couple of things that are confusing to me:

1. When I do a single file import to set the record and import the quantities on hand and serial numbers all at once, I see an adjustment in the Asset account for this which makes sense. I see no adjustment however to COGS (which may be correct, but this is what is confusing, see #2).