Skip Stock number if it's a Boucher number

"Skip" as in leave it blank when pasted from CDK

### Boucher number (N = Number)
```
# NNNNXX
typeof Number(fake2.slice(0, 4)) === 'number'
```

### Ford number
```
# PNNNXX or NNFGXX
isNaN(Number(fake2.slice(0, 4)))
```