Yep, put a jar with holes OVER (and covering) the inner cover if you want to feed. Don’t let the bees get into those empty boxes.
I know it’s tempting to feed, but this time of year Maryland should have lots and lots of nectar for the bees. White clover is a biggie. With all the rain in the eastern US this summer, surely there must be white clover in bloom out there. Linden trees are still in bloom here to.
Personally I wouldn’t feed since the bees will fill up valuable brood cells with syrup if they have access to too much. However if for some reason your combs are lacking of honey/nectar/syrup, then a little feed is OK.
You gotta remove the burr comb sooner or later, so now is a good time. You don’t really want to have a burred up mess going into winter. There is still PLENTY of time to get your bees ready for winter. I make splits in August that survive winter. Don’t get too paranoid about winter yet.
BTW... Sometimes it is best to just ignore our Finnish friend when he gets in one of his moods....