I also collect U.S. 5 liters though I do not hit them real hard. I've included several examples below for reference.
I view todays 5 liters having little value and rarity. But, an interesting collectible for the 5 liter collector or complement to the U.S. 128 ounce gallon collector.
As with the U.S. gallons, I did not show variants with the 5 liters. Just listed the major label cans that I have.
Variant Examples would be Olde Hickory:
It is the same can with a sticker at the top stating what type of beer is in the can.
Krogh's - Paper Label
Oberon - 2006
Oberon - 2007