Your transit pass must display all of the following information to support your claim:
・an indication that it is a monthly (or longer duration) pass;
・the date or period for which the pass is valid;
・the name of the transit authority or organization issuing the pass;
・the amount paid for the pass; and
・the identity of the rider, either by name or unique identifier.
If the pass does not have all of this information, you will also need to keep receipts, cancelled cheques or credit card statements, along with your pass(es), to support your claim.
これを見ると、必ずしもレシートが必要というわけではないみたいですね。
ただ「the identity of the rider, either by name or unique identifier. 」が必要ってことは、バスパスに自分の署名を書いておけば、他人は使えないってことですね。