She hadn't paid much attention to this thing at first, but later, seeing Yu Yan place all the treasures he obtained into the Green Jade Box, her curiosity was piqued.
She later learned that it was a storage box that could hold Spiritual Material and even living things; the Spiritual Material inside wouldn't just stay fresh, but could also continue to grow.
Sally remembered that there were quite a few Spiritual Materials inside her own System Space as well, but they were all scattered about like fruits and vegetables, which obviously wasn't ideal.
Yu Yan noticed she liked the Green Jade Box and actively gave it to her.
Moreover, although the treasures inside were pretty good, to be honest, he had no use for them. Sally, on the other hand, needed all sorts of tonics every time she got pregnant and was the one who really needed them.
Sally didn't just accept it for nothing, she gave him a "Compendium of Talismans" in return.