BlaBlaCar might be an option due to no trains. Carpooling from people who are travelling via car anyway with spare seats. I haven’t used it myself but check it out. Source: over 1 year ago

It exists called BlaBlaCar: blablacar.com or on App Store (UK): https://apps.apple.com/gb/app/blablacar-carpooling-and-bus/id341329033. Source: almost 2 years ago

Others mentioned something similar, but I would stake out on blablacar.com for the trips from Koloberzeg or nearby to where you live. Someone will eventually do it and you can have them deliver it for you :). Source: about 2 years ago

Well I have my own car. Here in Germany we have the website blablacar.com I've tried it a few times. Works really well, I'm thinking if its worth it to open up a company such as this here since there are only overprized taxis around, or trains which are also not cheap since corona virus. Source: over 2 years ago

(2) option 2: Look up blablacar.com, which could either get you straight to Prague, or do part of the journey where trains are awkward, e.g. Keszthely to Bratislava. Source: almost 3 years ago

As for the cardboard, it's easy to recycle, pretty efficiently. Plus you might look into this program: Https://givebackbox.com/amazon. Source: over 1 year ago

Do you think the item is in good enough condition to give to a friend for free? -- Try giving your items to friends and family. Otherwise, set the item at the end of your driveway and post it to Nextdoor and/or a Freecycle group on Facebook. If donating would make you feel better by helping someone else, take it to Goodwill, Savers, Salvation Army, a local library, a school, etc. Some donation centers even pick up... Source: about 2 years ago

At first, I thought OP's mention of "donation boxes" were actually these Give Back Boxes which would be filled with people's used items, but then OP clarified it to be mostly private label Chinese goods which makes more sense. Source: over 2 years ago