I left the transit bolts in our

Highly unlikely any damage will have been done so long as it hasnt been in use for a long time (weeks).

In a front loading washing machine, most of the mechanicals inside are held between springs at the top and dampers at the bottom. The transit bolts are used to minimse how much movement can ocour whilst the machine is in transit as excessive movement could damage the springs/dampers. When they are removed, normal movement of the mechanicals helps keep the machine stable and minmises vibration.

So, the worst that happens when the machine is used with the transit bolts in place is it vibrates alot, and possible moves about.

Remove the bolts as soon as possible and it should be fine.