The two most common couriers (cheapest) used by Sendle are Fastway/Aramex and Couriers Please.

Fastway/Aramex drivers wear red or sometimes red and black.....I am not sure what colours their vans are but most probably white with red badging.  They cannot be all red because that is the Australia Post colours.

Couriers Please drive yellow vans with red badging.  They wear yellow shirts with red collars and sleeve trims.

Any paperwork should be well badged with their company name.....although paperwork is now rather thin on the ground because of COVID.