With no service history you should assume it will need to be serviced.
I try to factor that in on the price, but it really depends on the popularity of a particular model.
You can also take the watch into an Omega Botique and they will test and inspect. They will let you know if a service is recommended.
I don't think there is much value in getting a new box. It's pretty common for those boxes to flake. I don't think many care, in fact it it may be odd to have a new box with that older watch.
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