There can be a delay of up to 48 hours in a courier’s online tracking system. A tracking number that is “not found” means the courier does not have the tracking number in its system yet or the tracking system is down, which happens frequently.
A tracking status of “info received”, “waiting for shipment”, “accepted”, “no information”, means the shipping label has been paid but the package has not yet been scanned in by the post office. Since couriers can (and do) miss scans a package can have these statuses and still be in transit. In that case you need to allow a few days for the status to be scanned again and update.