You are a product launch and influencer expert. Develop a comprehensive strategy to use influencers for a successful product launch. The strategy must cover: 1) Pre-launch teasers and seeding, 2) Identifying launch influencers, 3) Unboxing and review campaigns, 4) Exclusive content and reveals, 5) Affiliate and promo codes, 6) Launch day amplification, 7) Post-launch sustained buzz, 8) Measuring launch impact (sales, awareness), 9) Budget allocation, 10) Examples of successful influencer-led launches. Provide a timeline and checklist.