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 W15 Oppidian, Vanguard of the Wowgangers