What does "Last check" mean?

Shipments tracked on TrackBot are periodically updated by our systems automatically. It may happen that the tracking system of the courier is temporarily unavailable, therefore TrackBot won't be able to update the shipment.

The "Last successful check" text tells how long ago the tracking information was successfully updated by TrackBot (even without changes in the shipment status).

In the case that a shipment has still to be updated correctly you will instead see simply the "Last check".

In any case you can't manually request an update for the shipment.