If record number 1 shows up, renumber it to 5001 or some number which is way highter that the number of individuals in your data by entering the higher number in the record number area of the individual record.
If number 1 does not show up when you open UFT, select record number 1 using the "telescope" icon and then renumber it.
After you renumber record number 1, go back to record number 1 and if it is still there, renumber it to 5002 or higher.
Continue doing this until record number 1 is blank then find the record that you wish to be record number 1 (probably one of the ones in the 5001-500? area) and renumber it back to 1.
You can then renumber the other records to a lower number, say 20 and let UFT select an unused number or leave them where they are.
If you leave them where they are, you will have a large number of record numbers that are not used as UFT will continue numbering after the last 500? number.