When the ABS was removed and the braking system re-piped, presumably that was done and you can see that? They kept the ABS module in circuit to keep the speedo working. The ABS electronics should be next to the ABS pump module/battery which is the module on the left side with all the brake pipes going in and out of it.
You should make sure you know what modifications have been done to the braking system and what functions are still required from the ABS electronics now bodged under the seat.
If the ABS electronic module is like the ECU it will have a custom shaped cover fitting on a silicone seal. Such a critical component will have to survive the weathering tests (hosepipe!) and not allow water inside.
I think it would be difficult to make a cover to be a hermetic seal. If you want to keep the ABS brake bodge then consider buying a suitable size IP rated sealed ABS box, making sure wiring into it is through grommet seals. If you regard the box as enclosing 1000 volt electricity traveling at 100mph in the rain, then you will get the idea.
In UK your insurance company will ask you to declare modifications every year you insure the bike. The only way serious modifications like this would ever get approved would be if a vehicle engineer with professional registration were to assess and certify the modification as safe. That costs a lot of money and is what BMW would have done when they first designed the braking system and got type approval for it.
Therefore you will have to lie to your insurance company every year. If you tell the truth once your answer will be logged against your bike and all insurance companies will know lies are being told when any owner is asked the same question.
Just because a seller told you work was done professionally, doesn't mean they will give you a certificate from a registered vehicle engineer approved by insurance companies to say the 'custom modification' keeps the same or reduces the insurance risk. Therefore I suggest you have increased the risk to insurance companies be removing ABS on a type approved vehicle and one look under your seat after an accident will tell all and you could be personally liable for huge compensation.
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