Here are a few ways to handle a completed puzzle:
Disassemble: Disassembling is my favorite method. I currently use resealable sandwich bags, about 250 pieces per bag. This makes it convenient to work on again later or lend to friends, family, or guests. It has social value and makes it easy to get others involved. The puzzles look brand new when stored. I also enjoy taking out my favorite puzzles from time to time to admire and play with them.
Putting on Paper and Dividing into Small Pieces: Dividing into pieces preserves the puzzle's overall appearance, but it's not suitable for irregularly shaped pieces or puzzles with poor interlocking parts, as they will fall apart. If the puzzle box is large enough, you can use an A4 document bag to secure it. Some puzzle boxes are small, requiring paper cutting, and the box must be kept flat, making moving difficult. For puzzles I don't want to disassemble immediately, I divide them into pieces. I recommend using wood veneer as a base, as A4 paper is too soft and doesn't hold the pieces together well.
Frame: I've only framed mini puzzles. Large puzzles require glue to frame, which essentially renders them "unplayable" (unable to be played with or resold). And I don't want to see them every day; I just want to experience the process of playing with the puzzle. Also, after framing the puzzle, the box needs a separate place to store it. But this method is the most memorable and has a sense of ritual, so I still recommend it.
Buying a puzzle-specific folder: I haven't tried this. The principle is similar to framing, but it's not actually very convenient. Having a puzzle board at home is troublesome enough; it gets cluttered everywhere. It's already difficult to find a place that doesn't affect the aesthetics, and having another large folder is even harder to manage. However, compared to framing, it saves a lot of space and cost, and it also has sentimental value.
