Suggestion

[Mere_Mortal]

If you're interested in stopping unlawful trade, such as Rheinland MOX coming into Texas, then you're just going to have to use your wits to determine whether or not it is indeed from Rheinland. It should not be possible to look at a scan and just happen to know exactly where it came from. Any smuggler could easily switch the labels.

If you were to take a unit of it for analysis then you can look at the price list in order to determine for sure which it is. Any Liberty Navy or Police pilot should have Gettysburg on their list and that will show as having a value of 2045 if it is Liberty MOX. If the value is 250 then you know that it is Rheinland MOX.

If you're interested in selling it then you should know where it originated. If you don't know because you found it, then I suppose your crew don't have the expertise to establish it either so you'll have to lose it or run the risk of hauling it where it should not be.