Yes, I wouldn't get into the lies/truth, good/bad approach.
Our DCs are surviving, and react in ways that are functioning for survival in their earliest experiences, where all too often there wasn't enough (food, comfort, love, stimulation, soothing) to meet their needs.
So they take what they see themselves as needing, because that's what they need to survive. Even if it is X has a pink highlighter and they don't (tho they have yellow, green and blue highlighters).
Admitting they took it means admitting they are 'Bad' or 'Inadequate' or 'Scared' and is against their need to survive.
Focus on righting any wrong, because that is important. 'You don't have a pink highlighter, and Jane has lost hers. So we must give it back to Jane.'
Don't ask them for a truth they can't give, just state the situation and what needs to be done. If they argue then say that if you are wrong you will apologise and replace the item.
No drama