FileStore E01 and E20
Left hand side and we can see the serial numbers. E01 is product code AEH26, with serial number 408, and E20, being the rare, possibly even unique now, Communicator-coloured version has the product code AFH27 rather than the usual AEH27 for a FileStore E20. It's number 155.
The two units also have similar marker pen graffiti and green stickers, so maybe they did originate together in some past life.