Every chart on the site that derives from sealed price history carries the same disclosure footer:
Historical sealed prices reflect PriceCharting median sold comps. Single high-comp transactions on thin markets can produce volatility — we publish the same data a serious investor would want to read.
This isn’t a defensive asterisk. It’s an honest description of the data regime. Vintage sealed booster boxes change hands rarely. A given month might have one or two recorded comps for a product. When the median sold comp jumps from, say, $3,800 to $7,000 in a single month and back, that volatility is real signal — but it’s also a function of low transaction volume, not necessarily a real market move.
The brand voice is matter-of-fact: we’re not hiding from this, we’re surfacing it. A serious investor reads through this kind of noise. The platform serves them rather than dressing the data up.
Three places this disclosure is required (per docs/decisions/2026-05-04-data-quality-disclosure.md):
- Every era basket chart (
/eras/[slug]) - Every booster-box vs S&P 500 chart (
/sealed/[slug]/vs-spx) - Individual sealed product pages (
/sealed/[slug]when a chart is rendered)
The <SealedHistoryDisclosure> Astro component is the single source of truth — edit the copy there and it propagates everywhere.