Thanks for the opinions. The DME has always been very supportive and willing to work with me. I will mention my concern the next time I get a new mask. I was wondering if the way this DME is conducting business is standard for DME suppliers. It just seemed strange that when I get replacement pillows, they grab them from the same jars they threw my extra's into. If these extra pillows are used as free samples for a customer to try another size I might be more understanding, but if you think about it why would I need a sample if they other sizes are already in the package. The pouch is sealed, and that is how it should be given to the customer. If the DME gives me any guff about my concerns, it will be time to get a new DME and report this one.
If you are purchasing a new item it should be a closed packaged item. Normally any open packaged items are sold at a discount. If you receive an item that has been opened you cannot guarantee it's original state and if there is a problem with the item then it gives the company an out if it comes down to legal procedings. If they are replacing them with two of the correct size then it should be up to you if you do the swap.
Would you let a car dealer remove the spare tire as it is a different size to the tires on the car? One of the guys that was in the class when I went back to school was using a full set of spares on his car, it was all that he could afford and for $15-20 he could have tires that would last him for an entire school year(and a blow out only cost him $5).