Barrels of tar are the only form of occupied barrel I can think of that doesn't have an icon on the front of it They should have an icon
W7 Hermit, Honorary Ruskie W8 Hermit W10 Hermit W12 Hermit W13 Oppidian, Lawspeaker of Duckshead Bay, Straumfjord W14 Oppidian, Aldermann of Aldorice Reodcomba, Lord of Eirinsk, Duke of Sasheim