I am afraid there is no possibility to see all used RTs from other PEs. A PE router will only keep those VPNv4 prefixes, where at least one RT matches an import statement. All other prefixes are silently discarded for scalability reasons. Only a VPNv4 route reflector would keep all VPNv4 prefixes received by any PE. But even then there is no command listing all RTs present in the VPNv4 BGP table.
So the only way of getting all used RTs is to collect all PE configs and extract the RTs. In other words: make sure you document the RTs in use upfront (f.e. with ISC/ANA).
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