Note: If your current VoidChest has a 1.0x boost, which means it sells the items for the normal prices in the shop, after purchase it will have 2.0x boost for 48 hours, that means it will sell the items for twice the normal prices for 48 hours.
If your current VoidChest has a 3.0x boost (selling the items for 3 times the normal prices, after purchase it will have a 4.0x boost for 48 hours, after 48hours it will have 3.0x again)
