I won a couple auctions from one seller and he/she said he would combine shipping.  I sent a message requesting for an invoice of the total for the 3 auctions with the one shipping charge.  He just sent me an email stating my total for all 3.   Doesn't the seller have to actually send me an invoice with the total for all 3 auctions and shipping? 

Yes. Maybe drop him a note and ask again.

I just did this the other day. I had one buyer win three different bulk auctions. He asked for combine shipping. On the seller's control panel there's an option to see listings that are eligible for combined shipping.

I could select all three and then it generated an invoice that let me input a single amount for shipping.

Yeah that is what I thought.  I sent him a message requesting an actually invoice.  Just wanted to make sure...thanks