STAMP OFFICE is always a fiscal cancel in the colonies and commonwealth. Those New Zealand postal-fiscals are found with the same inscription in cancels, which are not always blue or purple either. Conversely, some collectors seem to be wary of any Malayan used dollar value. There is a large Malayan double circle cancel that I believe reads STAMP OFFICE (maybe STAMP DUTY). Since there's usually a partial strike on a stamp, it's hard to tell it's a fiscal. That cancel is often struck in black, too.
The GB Queen Victoria £1 is always liked with a nice Jersey postal cds, but that paid postage (as a very small part of the total) and revenue charges together. That might be the case for your $250 stamp being on a registered package. But without seeing the original thing, there might have been other postage cancelled postally, the fiscal cancelled fiscally. Hard to think there would only be a fiscal cancel. And a blue crayon may mean something else on a parcel tag or receipt, but still may have been use to indicate that this was on a registered piece of mail.
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that is Barefoot Catalogue so I presume the value is in GBP?
Yes, £££. Collectors over here complain about their pricing being way too high. It's probably in line for super perfect items, with a big drop for items in usual condition.