ML06O does not exist as transaction, I guess you meant VL06O
However, VL06O does not allow to track whether an outbound delivery was received, this is not the task of the people who make use or the outbound delivery monitor.
ME2M can be used to track open POs where the delivery is not yet posted goods issue (selection parameter WA351) , but you won't find those that are goods issued. Here you have only the option to list the POs. You can drill down into the PO and check the PO history tab to know the delivery number.
As it is not mandatory to do MIGO against outbound delivery in case of stock transfers it would be even more challenging to create an own report that would list unreceived outbound deliveries