Loot boxes in video games are a form of in-game transactions with randomised elements. Concerns have been raised about loot boxes’ similarities with gambling and their potential harms (e.g., overspending). Recognising players’ and parents’ concerns, in mid-2020, the Entertainment Software Rating Board (ESRB) and PEGI (Pan-European Game Information) announced that games containing loot boxes or any forms of in-game transactions with randomised elements will be marked by a new label stating ‘In-Game Purchases (Includes Random Items)’. The same label has also been adopted by the International Age Rating Coalition (IARC) and thereby assigned to games available on digital storefronts, e.g., the Google Play Store. The label is intended to provide more information to consumers and allow them to make more informed purchasing decisions. This measure is not legally-binding and has been adopted as industry self-regulation or corporate social responsibility. Previous research has suggested that industry self-regulation might not be effectively complied with due to conflicting commercial interests. Poor compliance with the ESRB’s, PEGI’s, and IARC’s loot box presence warning label was demonstrated in two ways. Firstly, 60.6% of all games so labelled by either the ESRB or PEGI (or 25.7% using a more equitable methodology) were not labelled by the other. Such inconsistencies were most likely caused by one age rating organisation failing to accurately identify loot box presence. Secondly, 71.0% of popular games containing loot boxes on the Google Play Store (whose age rating system is regulated through IARC) did not display the label and were therefore non-compliant. At present, consumers and parents cannot rely on this self-regulatory measure to provide accurate information as to loot box presence, particularly in relation to mobile games. The mere existence of this measure cannot be used to justify the non-regulation of loot boxes by governments, given the poor compliance and doubtful efficacy (even if when complied with satisfactorily). Improvements to the existing age rating systems are proposed. Preregistered Stage 1 protocol: https://osf.io/e6qbm (date of in-principle acceptance: 12 January 2023).