I'd say 4500 is a bit on the high side. Richmond holds 5500 officially and you'd easily have got another 1500 in the Shed, there was a big section of the upper Camac fenced off as a no-man's land and at full time, not that many Shels fans came on the pitch from there so it mustn't have been full. I'd say 4000 tops.
Still about four times better than our normal home crowd these days, and at a tenner a skull on average we'll happily trouser the extra €30k