I dont think so. The assistant says hold is risky so it may be a bad Idea, just sell now then buy a cheep thing and hold it and find out. Thats what I will do.
If u have goods in ur warehouse it doesnt matter how long it stays inside, the selling price will only get higher if u sell more goods together at once.
For example:
3 Crates are worth 36,000
6 Crates are worth 75,000 (avg)
And if u have 111(full large warehouse) crates the value will increase alot.
So if u sell 111 crates together, u will make more profit than if u sell 55 crates together and after that 56.