As a fan of online literature, I can't predict the future price of stamp sheets because the price of stamp sheets is affected by many factors such as market demand, stamp quality, release date, economic situation, etc. These factors are very complicated and uncertain. Moreover, there was currently no reliable prediction of the price of the Liye Qin bamboo slips for the next 12 years. If you are interested in the price trend, it is recommended to pay attention to relevant market trends and news and consult professional stamp investors or agents for more accurate information.