This may not help you anymore, but maybe somebody else is looking for a good and reasonably prices shipping company
to ship just a few boxes.
I know it can be pretty hard to find one.
I looked at the big boys like UPS, DHL and FedEx but they are pretty expensive when it comes to just a few heavy or big boxes.
I shipped my 5150 II tube amplifier and ENGL 4x12 speaker cabinet (more than 50 kgs) and a few more boxes.
The company that I used is called Parcelparcel.com (a Dutch company).
They were not only cheaper but they were very helpful and fast in replies over e-mail.
Funny thing was that they used FedEx for pick up and delivery from my Dutch home to my new Canadian home for a much better rate than what i could get through FedEx.
So, my advice is, use a smaller shipping company that specializes in delivering parcels worldwide and if you move from the Netherlands with only a few boxes, maybe Parcelparcel.com is the way to go for you.
Best regards,
Wiger