SBS 0073R on Townlink 293 is sometimes, not all the time,
common.
TIB 0905Y on Service 67, I'm not sure.
Volvo B10M MK3s on Service 225 is common. It is not anything
unusual even if buses like SBS 0591L come to 225.
SBS 2779A on Service 27, I am not sure. Have you seen this bus on
Service 27 before?
And for SBS 9190B on Service 72, there are definetely buses of this
kind on Service 72. Just look at SBS 9002L.