It has emerged Perth and Kinross Council (PKC) - which offered its help in 2016 with the scheme - still has questions regarding the roll-out of the Deposit Return Scheme.
PKC's Waste Services manager this week revealed to councillors officers had "only just" received an updated response to some questions and still had others outstanding.
An Independent councillor has claimed the scheme could have been "workable" and "ready to go" had PKC's offer to pilot the scheme been accepted.