Tracking post servce:
http://myparcels.ru/
USA: https://www.usps.com/
Canada: https://www.canadapost.ca/cpotools/apps/track/business/findByTrackNumber?execution=e4s1
Serbia: http://www.posta.rs/struktura/lat/aplikacije/alati/posiljke.asp
Thanks all prizers for confirmation!
Lydia