Hey just got some wheel bearings with a big shipment from the uk ! One of the seals has a nylon dust seal that sits on top of the hub seal ! Has anyone else had this set up ! They went on the hubs I have and never seen a set up like it before

They go on the Inboard side. Mokes from 1979 on had these

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Should I throw them over my shoulder or use them

For a road going car IMO they are of little value but for off roading (particularly creek crossings) they are very good.

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I decided to use it when I recently did a wheel bearing. The old one never had one but I figured having it there probably wouldn't reduce the life of the bearing.

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"In two years time your car will be like a lady's clothes, out of date, my car will still be in fashion when I am dead" - Sir Alec speaking to Pininfarina

Australian Minis didn't get them, they are used on UK cars to keep road slush, salt etc out of the hubs.
But if ya got em, no harm to use em. Watch you fit them with the correct seal, they seat against it.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.