1. Keep packing boxes for things of relatively high value. Such as laptops, tablets or smartphones. When you sell it in the future, your product will be more attractive to potential buyers, because a complete package will show that your product is authentic.
2. There is no need to keep boxes for inexpensive products. The packaging of the $50 headphones you buy may not have a significant impact on resale value, at most it may be only a few yuan difference.
3. Huge product boxes are not worth keeping unless the box itself may be useful in other ways. However, they often take up a lot of unnecessary space. Television boxes are the worst.